GB1399401A - Electric switches - Google Patents
Electric switchesInfo
- Publication number
- GB1399401A GB1399401A GB112372*[A GB112372A GB1399401A GB 1399401 A GB1399401 A GB 1399401A GB 112372 A GB112372 A GB 112372A GB 1399401 A GB1399401 A GB 1399401A
- Authority
- GB
- United Kingdom
- Prior art keywords
- arm
- lever
- contacts
- fulcrum
- snap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000000994 depressogenic effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000011435 rock Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
- H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
- H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H2071/109—Operating or release mechanisms with provisions for selecting between automatic or manual reset
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/1054—Means for avoiding unauthorised release
Landscapes
- Breakers (AREA)
- Thermally Actuated Switches (AREA)
Abstract
1399401 Thermal relays; snap-acting switches CUTLER-HAMMER EUROPA Ltd 14 Sept 1972 [11 Jan 1972] 1123/72 Heading H1N [Also in Division H2] A switch has a movable contact 30 carried on a snap-acting arm 36, a lever 16 for actuating the arm, the lever being resiliently biased by a coil spring against a fulcrum formed by a wire, and an actuating arm 18 movable to rock the lever about the fulcrum to actuate the switch. The arm 16 is mounted on a bracket 17 and is biased by the coil spring against its fulcrum which is formed by the middle portion of a spring wire clip 42. In the three phase thermal relay shown, the arm 18 is pivoted to each of a pair of slidable plates 14, 15 having slots in which the ends 12 of bimetallic elements 10 engage. Relative motion between the plates 14, 15 due to unequal heating of the bimetallic elements on unbalanced loading or due to the plate 15 abutting an adjustable temperature compensating strip 24 under overload conditions, causes the arm 18 to pivot and snap over the arm 36 to open the contacts 30, 32 and close the contacts 30, 31. The position of the fixed contact 31 may be changed by a lever 50 so that in the solid line position shown, the switch resets automatically when the bimetallic elements cool, but in the dotted position 31a requires manual resetting by a push button 61. This push-button has a forked end with camming surfaces so that when it is depressed it opens whichever contacts were closed and moves the arm 36 into a position from which it can reclose the contacts 30, 32 when the push-button is released. The arm 36 may be a trifurcated blade spring having a bowed central limb 40.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB112372*[A GB1399401A (en) | 1972-01-11 | 1972-01-11 | Electric switches |
AU48203/72A AU461408B2 (en) | 1972-01-11 | 1972-10-26 | Electric switches |
US00302268A US3800260A (en) | 1972-01-11 | 1972-10-30 | Electric switches |
JP48005827A JPS4878473A (en) | 1972-01-11 | 1973-01-10 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB112372*[A GB1399401A (en) | 1972-01-11 | 1972-01-11 | Electric switches |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1399401A true GB1399401A (en) | 1975-07-02 |
Family
ID=9716559
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB112372*[A Expired GB1399401A (en) | 1972-01-11 | 1972-01-11 | Electric switches |
Country Status (4)
Country | Link |
---|---|
US (1) | US3800260A (en) |
JP (1) | JPS4878473A (en) |
AU (1) | AU461408B2 (en) |
GB (1) | GB1399401A (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3866156A (en) * | 1973-12-26 | 1975-02-11 | Bernard Dimarco | Overload relay indicating means |
GB1595046A (en) * | 1978-04-25 | 1981-08-05 | Sprecher & Schuh Ag | Bimetallic thermo-release |
DE2914776C2 (en) * | 1979-04-11 | 1981-07-02 | Siemens AG, 1000 Berlin und 8000 München | Trigger for a thermal protection relay |
DE7910663U1 (en) * | 1979-04-11 | 1983-12-08 | Siemens AG, 1000 Berlin und 8000 München | Protection relay |
FR2536905A1 (en) * | 1982-11-25 | 1984-06-01 | Telemecanique Electrique | THERMAL RELAY |
US4520336A (en) * | 1983-12-01 | 1985-05-28 | Eaton Corporation | Electrothermally actuated switch |
DE3573862D1 (en) * | 1984-06-06 | 1989-11-23 | Mitsubishi Electric Corp | Thermal-type overcurrent relay |
US4528539A (en) * | 1984-06-28 | 1985-07-09 | Eaton Corporation | Reduced-size thermal overload relay |
JPH0347242Y2 (en) * | 1985-03-26 | 1991-10-08 | ||
JPS61230228A (en) * | 1985-04-05 | 1986-10-14 | 富士電機株式会社 | Thermal type overload relay |
KR900007372B1 (en) * | 1986-11-26 | 1990-10-08 | 미쓰비시뎅끼 가부시끼가이샤 | Thermal over current protective relay |
US4806897A (en) * | 1987-12-17 | 1989-02-21 | Eaton Corporation | Overload relay having adaptive differential mechanism |
JP3438405B2 (en) * | 1995-05-17 | 2003-08-18 | 松下電器産業株式会社 | switch |
JP5152102B2 (en) * | 2009-03-27 | 2013-02-27 | 富士電機機器制御株式会社 | Thermal overload relay |
JP4906881B2 (en) * | 2009-03-27 | 2012-03-28 | 富士電機機器制御株式会社 | Thermal overload relay |
JP4798243B2 (en) * | 2009-03-27 | 2011-10-19 | 富士電機機器制御株式会社 | Thermal overload relay |
JP4978681B2 (en) * | 2009-10-23 | 2012-07-18 | 富士電機機器制御株式会社 | Thermal overload relay |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2749407A (en) * | 1953-10-15 | 1956-06-05 | Electrical Apparatus Co Ltd | Single phasing preventor |
US2872548A (en) * | 1955-12-01 | 1959-02-03 | Fed Pacific Electric Co | Motor starters |
US3038051A (en) * | 1959-08-07 | 1962-06-05 | Gen Electric Canada | Thermal device |
US3183328A (en) * | 1963-04-08 | 1965-05-11 | Gen Electric | Electric switch with contact weld check means |
AT290654B (en) * | 1966-11-24 | 1971-06-11 | Francesco Fantini | Three-phase, electrothermal relay |
GB1250773A (en) * | 1968-11-23 | 1971-10-20 | ||
US3723929A (en) * | 1972-04-07 | 1973-03-27 | Furnas Electric Co | Bimetallic circuit overload protector |
-
1972
- 1972-01-11 GB GB112372*[A patent/GB1399401A/en not_active Expired
- 1972-10-26 AU AU48203/72A patent/AU461408B2/en not_active Expired
- 1972-10-30 US US00302268A patent/US3800260A/en not_active Expired - Lifetime
-
1973
- 1973-01-10 JP JP48005827A patent/JPS4878473A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
AU4820372A (en) | 1974-05-02 |
JPS4878473A (en) | 1973-10-22 |
US3800260A (en) | 1974-03-26 |
AU461408B2 (en) | 1975-05-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |